[fix] Audio Metadata Scanner now returns multiple artists for a track (if any)

Overview

This pull request is a:

Feature

Refactoring (no functional changes, no api changes)

Closes N/A

Refactored AudioMetadataScanner so that it returns more than 1 artists if they exist.

Make sure your PR meets these requirements:

[x] Based off latest master branch. Your branch must be up to date before closing.
[x] Changes were tested and contain NO breaking changes or known regressions
[x] Tests for bug fixes / features have been added (or this option is not applicable)
[x] All new code has been documented (or this option is not applicable)
[x] Headers have been added to all new source files (or this option is not applicable)

There are no breaking changes.

Its a change in the SDK but it will not affect Cores and Shell.